Usain Bolt (JAM) wins the 100m in 9.87 during the 2015 Sainsbury's Anniversary Games at Olympic Stadium at Queen Elizabeth Olympic Park. Kirby Lee-USA TODAY Sports
KINGSTON (Reuters) - Usain Bolt's coach is convinced the Jamaican phenomenon can once again put aside injury concerns and mediocre form to maintain his grip on the major sprint titles at this month's world championship.
The 28-year-old returns to the Bird's Nest stadium where he first stunned the world at the 2008 Olympics for the Aug 22-30 championships, bidding to retain his 100 and 200 metres titles.
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